A 4×4 MIMO antenna system for mobile tablets

This paper presents a 4×4 MIMO antenna system for mobile tablets. Each antenna of the MIMO system is capable of covering GSM 900(890-960MHz), GSM 1800(1710-1880 MHz), GSM 1900(1850-1990 MHz), UMTS (1920-2170 MHz), WLAN (2400-2480 MHz), WiMAX (3400-3600 MHz) and several LTE frequency bands. The MIMO antenna system is composed of four coupled fed monopole antennas which each antenna placed on the corner at the non-grounded portion of the circuit board. The substrate used for the circuit board is FR-4 substrate with relative permittivity of 4.4 and loss tangent of 0.02. The overall volume of the circuit board is 230 × 176 × 0.8 mm3 with each antenna occupying an area of 75 × 11 mm2. To improve the isolation between antennas of the MIMO system a decoupling structure, consisting of ground slots and decoupling strips, was etched on the bottom layer of the circuit board. The isolation achieved is better than 15 dB over all the frequency bands covered by each antenna leading to an envelope correlation coefficient of less than 0.09. The simulation and measured results are in good agreement.

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